If you view a block such as a flower with a very sharp angle of incidence, the texture can appear to extend considerably beyond where it normally is as a result of the new mipmapping rules. See attached screenshots.
This gets very annoying to notice once you walk past flowers enough and they flicker shards of themselves outside where you’d expect.
A proper anisotropic filtering system would fix this (at this angle you’d get a 16x1 texture rather than a 16x16 texture), though I also wonder if it’d make sense to restrict mipmapped textures to the cutout shape of the non-mipmapped version in the meantime.
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The issue is very noticable on fire/soul fire.
I would recommend Mojang looks into the fix Sodium recently employed for a similar issue
https://github.com/CaffeineMC/sodium/issues/2631